2-way runner runner decision

[DeeJ]

Call or 3-bet the river? No reads on villain, sadly.

Paradise Poker 5/10 Hold'em (9 handed) converter

Preflop: Hero is UTG+1 with K[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">2 folds</font>, MP3 calls, CO calls, Button calls, <font color="#666666">1 fold</font>, BB calls.

Flop: (10.40 SB) 8[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(5 players)</font>
BB checks, Hero checks, MP3 checks, <font color="#CC3333">CO bets</font>, Button folds, BB folds, Hero calls, MP3 folds.

Turn: (6.20 BB) T[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">CO bets</font>, Hero calls.

River: (8.20 BB) J[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">CO raises</font>

Hero ?